ICU-22781 Adding support for constant denominators (C++) #3382

Job	Run time
clang-valgrind-test	10m 33s
clang-valgrind-intltest (utility)	6m 55s
clang-valgrind-intltest (normalize)	6m 13s
clang-valgrind-intltest (collator)	5m 35s
clang-valgrind-intltest (regex)	5m 45s
clang-valgrind-intltest (format)	16m 28s
clang-valgrind-intltest (translit)	6m 14s
clang-valgrind-intltest (rbbi)	8m 10s
clang-valgrind-intltest (rbnf)	7m 6s
clang-valgrind-intltest (rbnfrt)	6m 10s
clang-valgrind-intltest (icuserv)	6m 1s
clang-valgrind-intltest (idna)	5m 24s
clang-valgrind-intltest (convert)	7m 11s
clang-valgrind-intltest (rbnfp)	5m 11s
clang-valgrind-intltest (csdet)	5m 19s
clang-valgrind-intltest (spoof)	5m 15s
clang-valgrind-intltest (bidi)	5m 38s
	1h 59m 8s

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